56505720 has 32 divisors (see below), whose sum is σ = 169517520. Its totient is φ = 15068160.

The previous prime is 56505719. The next prime is 56505721. The reversal of 56505720 is 2750565.

It is an interprime number because it is at equal distance from previous prime (56505719) and next prime (56505721).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56505721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 235321 + ... + 235560.

Almost surely, 2^56505720 is an apocalyptic number.

It is an amenable number.

56505720 is an abundant number, since it is smaller than the sum of its proper divisors (113011800).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

56505720 is a wasteful number, since it uses less digits than its factorization.

56505720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 470895 (or 470891 counting only the distinct ones).

The product of its (nonzero) digits is 10500, while the sum is 30.

The square root of 56505720 is about 7517.0286682971. The cubic root of 56505720 is about 383.7344626897.

The spelling of 56505720 in words is "fifty-six million, five hundred five thousand, seven hundred twenty".